All functions depend on single CPU, A
crystal controlled temperature circuit provides constant compensation
for the temperature drifting.

Technique specifications:

A. Measurement

1. Input terminal

There are 3 input terminals on this
instrument:

CHA. High frequency 50 MHz - 2,4000 MHz

CHB. Low frequency 10Hz - 50 M Hz

Crystal Oscilloscope: for crystal
measurement

Step

Function

Frequency

Resolution

0.1 S

1.0 S

5.0 S

10 S

Frequency Measurement

2400MHz - 1000MHz

1 KHz

100Hz

100Hz

100Hz

990MHz - 100MHz

1 KHz

100Hz

10 Hz

10Hz

99 MHz - 50 MHz

1 KHz

100Hz

10Hz

10Hz

50 Mhz-4 Mhz

100Hz

10 Hz

1Hz

1 Hz

2

4 Mhz - 10 Hz

10 Hz

1 Hz

0.1 Hz

0.1Hz

3

4

Counting

Max 99999999

-

-

Crystal Oscillator Measurement

16M Hz -3.5 M Hz

10 Hz

1 Hz

1 Hz

1 Hz

Gate Time:
0.1S,1.0S,5.0S, 10S

Accuracy: Time base deviation X frequency +-
1 d

Progressive Counting measurement

4 steps CHB input terminal

resolution: +- 1d, counting frequency: 10Hz
- 4Mhz

Crystal measurement:

Input Features:

Input sensitivity for CHA 25mVrms/200m Vrms

Input impedance: approx. 50 Ohm

Max safety voltage 3 V

Input sensitivity for CHB: No.2 range 25m
Vrms/80 m Vrms

No.3 range
10mVrms/30m Vrms

Input impedance: approx. 1 M ohm ( less than
35 pF)

Max Input safety voltage: 30V

Time base:

Short term stability: +- 3 X 10-9/second

Long term stability: +- 2 X 10-5/Month

Temperature: +- 2 X 10-5/10oC
- 40o C

Power: 110 - 220V

Size: 270 X 215 X100 mm

Weight: Approx. 1550 g.

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Model
SRB3371 / SRB3381 - Multi function Counter

Feature
Microprocessor to realize intelligent measurement;
Low pass filter and attenuator in pre-position circuit;
Count backwards, realize the equivalent accuracy
measurement with fast speed and high sensitivity;
Micro SCM to measure freq period and intelligentize the management;
LSI design and CPLD application to diminish the components qty
and the average working time be not less than 10000h without fault;
Fine outline, small, light, easy to handle;
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